Definition of vigilant adjective from the Oxford Advanced American Dictionary

     

    vigilant

     adjective
    adjective
    NAmE//ˈvɪdʒələnt//
     
    (formal)
     
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  1. 1very careful to notice any signs of danger or trouble synonym alert, watchful
  2. 2 A pilot must remain vigilant at all times. The thief was spotted by vigilant neighbors.
NAmE//ˈvɪdʒələns//
 
noun [uncountable] synonym She stressed the need for constant vigilance.
 
adverb
See the Oxford Advanced Learner's Dictionary entry: vigilant